Why is importing bcrypt causing a "Cannot find module napi-v3/bcrypt_lib.node" error?

Using bcrypt, I get this server-side runtime import error only when deployed (on Vercel.com using Next.js /api routes which are AWS Lambdas under the hood):

41f80   ERROR   Error: Cannot find module '/var/task/node_modules/bcrypt/lib/binding/napi-v3/bcrypt_lib.node'  Require stack:  - /var/task/node_modules/bcrypt/bcrypt.js  - /var/task/.next/serverless/pages/api/login.js  - /var/task/___next_launcher.js  - /var/runtime/UserFunction.js  - /var/runtime/index.js      at Function.Module._resolveFilename (internal/modules/cjs/loader.js:880:15)      at Function.Module._load (internal/modules/cjs/loader.js:725:27)      at Module.require (internal/modules/cjs/loader.js:952:19)      at require (internal/modules/cjs/helpers.js:88:18)      at Object.<anonymous> (/var/task/node_modules/bcrypt/bcrypt.js:6:16)      at Module._compile (internal/modules/cjs/loader.js:1063:30)      at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)      at Module.load (internal/modules/cjs/loader.js:928:32)      at Function.Module._load (internal/modules/cjs/loader.js:769:14)      at Module.require (internal/modules/cjs/loader.js:952:19) {    code: 'MODULE_NOT_FOUND',    requireStack: [      '/var/task/node_modules/bcrypt/bcrypt.js',      '/var/task/.next/serverless/pages/api/login.js',      '/var/task/___next_launcher.js',      '/var/runtime/UserFunction.js',      '/var/runtime/index.js'    ]  }  

I definitely npm installed it:

"bcrypt": "^5.0.1",  

It works locally, but not when deployed.
I'm using the library server-side.
I've scoured the internet for hours trying to find the answer to this, but I can't find anyone who's has this exact issue.

Local node version: v14.16.0
Hosted node version: v14x

https://stackoverflow.com/questions/66729013/why-is-importing-bcrypt-causing-a-cannot-find-module-napi-v3-bcrypt-lib-node-e March 21, 2021 at 01:01PM